United Airlines flight 175 was hijacked on September 11, 2001. It is believed that the hijacking took place shortly after 9:42 AM. At that time, the flight made its last communication with air traffic controllers. Some five minutes later the plane’s transponder code was changed. At 8:52 AM a flight attendant called United Airlines and informed officials that the plane had been hijacked and that both pilots were dead. The plane was flown into the South Tower of the World Trade Center at 9:03:11 AM.
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